Y2kmustang said:
http://www.amazon.com/Motor-Medic-Gunk-M5012-Substitute/dp/B002008NWA
add both the lead substitute and 4 oz of marvel mystery oil to each tank of fuel, the combo will greatly reduce valve seat wear, if you ever pull the heads to get a valve job insist on the machine shop installing hardened valve seats and new valve guides, valve seals and checking all the valve train clearances, and I highly recommend a 3 angle valve job and a 30 degree back cut on the valves
http://garage.grumpysperformance.co...olishing-combustion-chambers.2630/#post-50247
http://garage.grumpysperformance.co...t-compressed-when-installed.11356/#post-51869
http://garage.grumpysperformance.co...-loads-and-installed-height.10709/#post-46627
http://garage.grumpysperformance.com/index.php?threads/valve-seal-selection.10469/#post-43881
http://garage.grumpysperformance.co...lve-seat-angles-and-air-flow.8460/#post-29682
http://garage.grumpysperformance.com/index.php?threads/multi-angle-valve-job-related.3143/#post-8387
http://garage.grumpysperformance.co...oper-valve-spring-seats-shims.1005/#post-1818
http://garage.grumpysperformance.com/index.php?threads/how-to-lap-valve-seats.1159/#post-2362
non-hardened valve seats regress into the head over time if used with non-leaded gas.
heads can be machined for hardened seats to allow use of unleaded fuel
hardened seats are then machined to properly seat the valves and ideally port and bowl work done to increase flow and reduce turbulance
http://www.rlengines.com/Web_Pages/Valve_Seat_Installation.html
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